Support VSCode 1.49 format modified lines feature

[AlCalzone]

VS Code doesn't support this natively. We would only add this if VS Code's edit providers add this type of API.

Originally posted by @ntotten in #630 (comment)

Since version 1.49, VSCode has the option to apply auto-formatting only to modified lines. Maybe its worth revisiting the referenced issue now.

[ntotten]

I'll look into it. Prettier formatting of partial documents though tends to be not very good.

[villecoder]

Fairly certain microsoft/vscode#107151 is related to this.

[CoLdAs1cE]

Any update on this? Would be awesome!
@ntotten

[its-jman]

@CoLdAs1cE This plugin supports formatting modified lines. Instead of running the Format Document command, you will need to run the Format Modified Lines command.

[CoLdAs1cE]

@CoLdAs1cE This plugin supports formatting modified lines. Instead of running the Format Document command, you will need to run the Format Modified Lines command.

yeah that seems to work somewhat, but dont like jsx 😄, if u have a
return ( <div className=''> <div className=''></div> </div> ) (styling did not apply here, but they are on different lines)
it will format both the or all the divs inside ( not the div with className you added or removed)

[ntotten]

Range formatting doesn't work very well in prettier. There are many issues open with the core library: https://github.com/prettier/prettier/issues?q=is%3Aissue+is%3Aopen+range+

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